AN413 datasheet(39/45 Pages) STMICROELECTRONICS

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AN413

Examples of SCI configurations

Doc ID 1875 Rev 2

39/45

Appendix E

Examples of SCI configurations

;***********************

; SCI

;constant declarations.

;***********************

PRIORITY_SCI = 4

; SCI priority level

DIV_9600 = 78

; BRG divisor for a 9600 baud clock

; with a 12 MHz system clock.

DIV_4800 = 156

; To generate a 4800 bds clock.

DIV_2400 = 312

; To generate a 2400 bds clock.

DIV_1200 = 614

; To generate a 1200 bds clock.

VC_9600 := 4

; Character for 9600 bauds.

Return = 00dh

LNG_DMA_SCI := 0Fh

; DMA length.

DEPART_DMA_SCI := 0A0h

; Start DMA address .

; BK_DMA_SCI reserved for this.

NUM_TDAP := 6

; Contains DMA transmit address pointer value.

NUM_TDCP := 7

; Contains DMA transmit address counter value.

data := r2

; data hold register

rec_ptr := rr6

rec_cpt := rr8

;********************************************************************

; function:

;

- I/O ports initialization.

;

- Speed and frame initialization.

;

- Compare register initialization.

;

- Interrupt and DMA configuration.

;

; Interrupt request:

;

- Receive error.

;

- Receiver data.

;

- end of DMA transmit.

;

; inputs: none

;

; outputs:none

;

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